Apply per file flags corresponding to --strict to wormholetesting.py

mypy.ini

@@ -7,4 +7,4 @@ show_error_codes = True
 warn_unused_configs =True
 no_implicit_optional = True
 warn_redundant_casts = True
-strict_equality = True
+strict_equality = True

src/allmydata/test/cli/wormholetesting.py

@@ -29,6 +29,7 @@ For example::
     import wormhole
     run(peerA(wormhole))
 """
+# mypy: warn-unused-configs, disallow-any-generics, disallow-subclassing-any, disallow-untyped-calls, disallow-untyped-defs, disallow-incomplete-defs, check-untyped-defs, disallow-untyped-decorators, warn-redundant-casts, warn-unused-ignores, warn-return-any, no-implicit-reexport, strict-equality, strict-concatenate
 
 from __future__ import annotations